Shaft-bearing.



W. E. BRADSHAW. SHAFT BEARING. APPLIATIOH .FILED SEPT. 20, 1906.

Patented Juy 22, 1913.

WITNESSES: @KM

-UNHED- ldjallhl WILLIAM zh?. BEADS-EAW, @F WILKINSBVURG, PENNSYLVANIA, ASSIGNOR T0 WEST- -NG-HQUSE vELlilfa 8c MANUFACTURING COMPANY, A CORPORATION 0F PENN- SYLVAIN-IA.

SHLFT-BEARING.

Specification of Letters atent.

rammed .muy ee, 191e.

ppillcti'ion 'lied September 2G, 1.938. Serial No. 335,510.

To 'whom t 'may concern lmown that il., Wimmer lid. Basusiravuaiciftiaen 'or' the United States, and a resident of Wilkinsburg, in the county of Allegheny and Stateot tdenfnsylvania, have invented-a new and useful improvement in Shaft-Bearings, of which the following is al specification.

My invent-ion relates to shaft bearings,

vand particularly to such as are employed the movable members and protected from injury during transportation of vthe devices. i Figure 1 of the accompanying drawing is a vertical. sectional view -through the bearings and movable member of an instrument that embodies m invention. Fig. 2 is an enlarged vertical sectional view through the upper bearing shown in Fig. 1, and Fig. 3 is a similar view of the lowso bearing shown in Fig. 1. Mounted between bearings 1 and 2 is a shaft 3 that carries a movable member i which, in the present instance, is the armature of an electrical measuring instrument. The bearing at 1 comprisesY a screw 5 having a smooth portion of its shank 4seated in a stationary part 6 of the instrument, and having a recess in its lower end in which is located a Suitable bearing sleeve 7 tor the upper reduced end 3a of the shaft. Threaded upon the lower end of the screw 5 is collar 8 having an annular recess 8a in its upper face in which is located a helical compression spring- 9 that serves to hold the collar 8 out of engagement with the part t) and the head of the screw 5 in engagement with the upper face thereof. A slot 10 provided in the outer edge ot the collar 8 for the reception of a pin 11 that projects downwardly from the part 6, and thereby prevents rotation of the collar 8 as it moved into and out of engagement with the shoulder upon the shaft 3 at the lower end of the part 3".

The lower end of the shaft 3 is provided with an extension 12, in :the lower end ot' which is mounted a sapphire or other suitable jewel 13` having a concave lower face bearing'upon a hardened steel ball 14 thatI rests upon a similar jewel 15. The jewel 15 ismounted 'in the upper end of a piece 16 that is itted within a sleeve 17 having a fiange or stop 18 upon its internal surface, against which the piece 16 is normally iield by means of a helical compression spring l) that is interposed between the piece 16 and a. screw plug 20. The upper end of the sleeve 17 surrounds the extension 12 und. serves to maintain the .bearings in alinement and to prevent loss of the ball 14. The

sleeve 17 is screwethreaded into a stationary part 21 ot the 'instrument and is provided with a lock nut 22 for securing it in any position to which it maybe adjusted lwhen assembling the instrument. Y-

1n the ordinary operation of the instrument, the spring 19 maintains the piece 16 in the position shown and provides a resilient support for the movable element of the instrument. In order to prepare the instrument for transportation, the screw 5 should be adjusted so aste permit the spring 9 to cause the collar 8 to engage .the shoulder upon the upper end of the shaft and thereby effect longitudinal movement -of the shat't against the pressure exerted by the s ring 19, until the extension 12 is cause to engage the flange or stop 18. It will, of course, be understood that the force exerted by the spring 9 is such as to over'- come that exerted by the spring 19. The shaft of the instrument is thus rlgidly supported and the bearing jewels are relieved :from all jars and shocks that might-result if the movable member were supported thereby during transportation of the instrument, and there is little or no danger of destroying or injuring the jewels.

While my invention has been shown and described as embodied in a specific structure, it will, of course, be understood that it may be employed in other structures, and that the structural detailsand arrangement ot the paints may be considerably varied, without ,altering the mode` of operation of thel invention or departing from its spirit, and I desire that the invention be construed to cover all such modifications.

I claim as my invention:

1. The combination witha vertical shaft, a longitudinally'movable block having a jewel bearing for the lower end ofthe shaft,

a supporting spring for said block, a rotatable bearing for the upper end 0I said sha-ft., and a 'supportfor said rotatable bears in/g, of a collar that surrounds the bearing andthe shaft and may be moved into and.

out of engagement with the shaft'by rotation of the bearing, the said collar having an annular recess and resilient means interposed between thev collar and the sup'4 port and located in the said annular recess.

2. The combination with a vertical shaft,

'ya longitudinally movable block having a yjewel bearing for -the lower'endv of said shaft, a supporting spring for said block, a

,rotatable bearing for the upper end of said shaft anda support for said rotatable bearing, of a collar that surrounds the bearing and the shaft and may be moved into and out of engagement Withrthe shaft by rotation of the bearing, the said collar having an annular recess, resilient means interposed between the collar and the support and located in the said annular recess, and means for preventing rotation of the collar.

3. The combination with a vertical shaft,

`a longitudinally movable sp1'ing-supported bearing for the lower end of the shaft, a rotatable bearing for the upper end of said shaft and a support for said bearing, of a collar that is screw-threaded upon the bearing and may be moved into and out of engagement With the/shaft by rotation of the bearing, the said collar having an annular recess, and resilient means interposed vbuetween the collar and support and located in the said annular recess.

el. The combination with a vertical shaft,V

a longitudinally. movable spring-supported bearing for the lower end of the shaft, a rotatable bearing for the upper end Iof said shaft and a support for said bearing, of a collar that is screw-threaded upon the bear# ln testimony whereof, I have hereunto vsubscribed my name thisllth day of September, 1906.

WILLIAM M. BRADSHAW. litnesses:

Orr S. SGHAIRER,

Brimer HINES. 

